Preparation and Down-conversion Luminescent Properties of Tb3+, Yb3+ co-doped Sr2B2O5

Abstract

Tb 3+ and Yb 3+ co-doped Sr 2 B 2 O 5 phosphors were synthesized by conventional solid-state reactions. The obtained Sr 2 B 2 O 5 : Tb 3+ , Yb 3+ phosphors were characterized by X-ray diffraction (XRD) and photoluminescence (PL) spectra. XRD results show that all prepared phosphors can be readily indexed to pure monoclinic phase of Sr 2 B 2 O 5. The dominant excitation at 374 nm was observed among three strong excitation peaks located at 354, 374 and 487 nm monitored at 543 nm and 980 nm, by which Sr 2 B 2 O 5 phosphors could be considered as having a strong absorption in the near ultraviolet region of sunlight. Under the ultraviolet light excitation at 374 nm, the strong intensity of visible emission from Tb 3+ : 5 D 4 → 7 F J (J = 6, 5, 4, 3), and near-infrared (NIR) emission from Yb 3+ (2 F 5/2 → 2 F 7/2) were detected. The relationship between the luminescence spectra and Yb 3+ doping content demonstrated the monoclinic Sr 2 B 2 O 5 exhibited the excellent quenching concentration.